Carcillo, 26, is an agitator who had two goals, four assists and 127 penalty minutes in 57 regular-season games with the Philadelphia Flyers last season. the forward reportedly inked a deal worth $775,000.

The 37-year-old Brunette inked a $2 million deal with the Hawks after compiling 18 goals and 28 assists in 82 games with the Minnesota Wild last season. He has played 1,032 career NHL games and has 256 goals and 450 assists for 706 points.

Mayers, a 31-year-old right wing, had three goals, 11 assists and 124 penalty minutes last season for the San Jose Sharks. The deal reportedly is for one year at $555,000.

O'Donnell, a 39-year-old defenseman, had one goal and 17 assists with the Flyers last season.

The Hawks also signed center Brett McLean, who used to play for them, to a two-way deal. McLean played in Switzerland the last two seasons.

"We're looking for a certain style of player," Bowman said. "If you’re looking for the No. 1 center or that kind of player, maybe (the draft class) is not as strong. We haven't been focusing on that because we’re comfortable with the players we have in those roles. We’re trying to get a little different kind of player into our mix here."

Check back for signings as they happen and follow along on Twitter with @ChrisKuc